Table 1.

Quality of life, daytime sleepiness, and sleep duration by sport specialization among female high school volleyball athletes

Variable	Low (n = 591), Median ± IQR	Moderate (n = 436), Median ± IQR	High (n = 455), Median ± IQR
PedsQL
Physical function	93.8 ± 16	93.8 ± 16	90.6 ± 12 a,b
Emotional function	90 ± 25	90 ± 20	90 ± 25
Social function	100 ± 10	100 ± 10	100 ± 10
School function	95 ± 10	95 ± 10	95 ± 10
Psychosocial summary	93.3 ± 10	93.3 ± 10	93.3 ± 8.3
Total score	92.4 ± 9.8	93.5 ± 11	91.3 ± 9.8 b,c
PDSS total sleep score	10 ± 8	10 ± 8	11 ± 8 a,b
Weekday sleep duration, h	8 ± 1	8 ± 1	7 ± 1
Weekend sleep duration, h	8 ± 2	8 ± 2	8 ± 2

IQR, interquartile range; PDSS, Pediatric Daytime Sleepiness Scale; PedsQL, Pediatric Quality of Life.

^aP < 0.05 compared with low specialization.

^bP < 0.05 compared with moderate specialization.

^cP = 0.05 compared with low specialization.